This preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full DocumentThis preview has intentionally blurred sections. Sign up to view the full version.
View Full Document
Unformatted text preview: 10/4/11 1 Chapter 20 *RIGHT HAND RULES 10/4/11 2 Chapter 20 *RIGHT HAND RULES 10/4/11 2 Chapter 20 *RIGHT HAND RULES 10/4/11 3 Chapter 20 *RIGHT HAND RULES L L 3 L 3. is taken in the direction of I. L wire with a current in a Feld: B 10/4/11 4 Chapter 20 *RIGHT HAND RULES Righthand rule number 4 * Direction of B : Use the right hand rule. Curl fingers in direction of current flow in loop and thumb points in the direction of B. 10/4/11 5 RL Circuits Initially, an inductor acts to oppose changes in current through it. A long time later, it acts like an ordinary connecting wire. 10/4/11 6 RL Circuits ( ε on) I = ε R 1 − e − Rt / L ( ) = ε R 1 − e − t / τ RL ( ) V L = ε e − Rt / L = ε e − t / τ RL Current Max = ε / R 63% Max at t = L / R Voltage on L Max = ε / R 37% Max at t = L / R 10/4/11 7 RL Circuits R I ε a b L I • Why does τ RL increase for larger L? • Why does τ RL decrease for larger R? L opposes change in current & slows down the rate of change Large R decreases final current “easier charge up goal” Large R dissipates energy quicker, speeds up “discharge of inductor” (speeds up current loss) 10/4/11 8 Sources...
View
Full
Document
This note was uploaded on 12/04/2011 for the course PHYS 220 taught by Professor Chang during the Spring '09 term at Purdue.
 Spring '09
 CHANG
 Physics, Current

Click to edit the document details